Not sure if all of them were done the same way out of each of the different locations but yes, at least in my case it was glued.
Pry bar, scraper, grinder with a brush wheel or stripping disc followed by a coating of Por15
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'03 Ford E350 7.3L Diesel
(de)SMB'd Custom RB-50
Quigley 4X4 w/Deavers & Agile Offroad's R.I.P. package
CCV High Profile Pop Top